Logitech z540 speakers on IC7G - only 2 out of 4 work...help?

I'm trying to hook up the Logitech z540 speaker system to the IC7G onboard sound.

I can either get the front 2 speakers and the sub to work, or the 4 satellite speakers without the sub.

Can anyone tell me how I should hook up this 4.1 speaker set to the 5.1 onboard sound?

I'll also post this in the sound forum, as I'm not sure where it really belongs at this point.

Thanks.

Ok first lets start of with your sig right now your at 15 lines 2 over the sig limit. First place the rear speakers on the rear output and front on the front. Set it up as either quad or 4 speaker in the set up. Just remember with 4.1 you'll get the same sound out of the rear speakers as you do the front.